Update src/streamlit_app.py

src/streamlit_app.py

@@ -4,13 +4,10 @@ import pandas as pd
 import streamlit as st
 
 """
-# Welcome to Streamlit!
+# Welcome to the exercises of reinforcement learning! 
 
-Edit `/streamlit_app.py` to customize this app to your heart's desire :heart:.
-If you have any questions, checkout our [documentation](https://docs.streamlit.io) and [community
-forums](https://discuss.streamlit.io).
-
-In the meantime, below is an example of what you can do with just a few lines of code:
+In this exercise we will train two popular deep reinforcement learning agents that you have learned through your courses.
+This is the time to put that knowledge to practice!
 """
 
 num_points = st.slider("Number of points in spiral", 1, 10000, 1100)